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Finding the Fourth Proportional to 771.51, 1,064.23 and 561.41

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Solution

The fourth proportional to 771.51, 1,064.23 and 561.41 is: 774.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.51 : 1,064.23 = 561.41 : x
  2. Step 2: Convert to fraction form
    771.51/1,064.23 = 561.41/x
  3. Step 3: Cross multiply
    771.51x = 1,064.23 × 561.41
  4. Step 4: Simplify right side
    771.51x = 597,462.64
  5. Step 5: Solve for x
    x = 597,462.64/771.51
  6. Step 6: Final answer
    x = 774.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.